Prince William and his wife Kate, Duke and Duchess of Cambridge, view an orchid hybrid named after Diana, late Princess of Wales, during a tour the Orchid Garden within the Singapore Botanical Gardens in Singapore on Tuesday, Sept. 11, 2012. The British royal couple is on an official three-day trip to Singapore.

Kate, Duchess of Cambridge, smiles during a ceremony naming a hybrid orchid in their honor at the Orchid Garden within the Singapore Botanical Gardens in Singapore, Tuesday, Sept. 11, 2012. The Duke and Duchess of Cambridge are on an official three-day trip to Singapore.

Prince William and Kate, Duke and Duchess of Cambridge, view a hybrid orchid named in their honor at the Orchid Garden within the Singapore Botanical Gardens in Singapore on Tuesday, Sept. 11, 2012. The British royal couple is on an official three-day trip to Singapore.

Britain's Prince William, right, and his wife Kate, second from left, the Duke and Duchess of Cambridge greet people during their tour at Gardens by the Bay in Singapore, Wednesday, Sept. 12, 2012.

Britain's Kate, the Duchess of Cambridge, greets a young boy during her tour in Gardens by the Bay in Singapore, Wednesday, Sept. 12, 2012.

Britain's Kate, the Duchess of Cambridge, receives flowers from fans at Gardens by the Bay in Singapore Wednesday, Sept. 12, 2012. Britain's Prince William, the Duke of Cambridge, and his wife Kate are in the city-state as part of their nine-day tour of the Far East and South Pacific to mark Queen Elizabeth II's Diamond Jubilee.

Britain's Prince William, the Duke of Cambridge, greets his young fans during his visit to Gardens by the Bay in Singapore Wednesday, Sept. 12, 2012. William and his wife Kate, the Duchess of Cambridge, are in the city-state as part of their nine-day tour of the Far East and South Pacific to mark Queen Elizabeth II's Diamond Jubilee.

Britain's Prince William, left, and his wife Kate, the Duke and the Duchess of Cambridge during their tour in the Cloud Forest of Singapore's Gardens in Singapore, Wednesday Sept. 12, 2012.

Kate, Britain's Duchess of Cambridge, talks with a student as she attends an art therapy session, part of the Rainbow Centre's special education program for children with special needs, at the center's Margaret Drive school in Singapore Wednesday, Sept. 12, 2012. Prince William and his wife Kate, the Duke and Duchess of Cambridge, are on a nine-day tour of the Far East and South Pacific.

Britain's Kate, the Duchess of Cambridge, leaves after greeting fans at Gardens by the Bay in Singapore Wednesday, Sept. 12, 2012. Britain's Prince William and his wife Kate's visit to Singapore is their first stop on a nine-day tour of the Far East and South Pacific.

CORRECTS DATE - Britain's Prince William and his wife Kate, the Duke and Duchess of Cambridge, join children on stage during a performance by children from Rainbow Centre, a school for disabled children, in Singapore Wednesday, Sept. 12, 2012.

CORRECTS DATE - Britain's Prince William's wife Kate, the Duchess of Cambridge, joins children on stage during a performance by children from Rainbow Centre, a school for disabled children, in Singapore Wednesday, Sept. 12, 2012.

CORRECTS DATE - Britain's Prince William and his wife Kate, the Duke and Duchess of Cambridge, join children on stage during a performance by children from Rainbow Centre, a school for disabled children, in Singapore Wednesday, Sept. 12, 2012.

Britain's Prince William, right, and his wife Kate, left, the Duke and the Duchess of Cambridge are seen during their visit to a local housing estate, Wednesday Sept. 12, 2012 in Singapore.

Britain's Prince William and his wife Kate, the Duke and Duchess of Cambridge, are welcomed by a lion dance performance during their visit to Strathmore Green, a precinct in Queenstown, a residential district of Singapore on Wednesday, Sept. 12, 2012. Britain's royal couple are on a nine-day tour of the Far East and South Pacific.

Kate

Kate, Duchess of Cambridge, smiles during a ceremony naming a hybrid orchid in their honor at the Orchid Garden within the Singapore Botanical Gardens in Singapore, Tuesday, Sept. 11, 2012. The Duke and Duchess of Cambridge are on an official three-day trip to Singapore.